I have an unusual problem. I use AVR Studio 4, the GCC compiler chain and the AVR ISP2 to program Tiny 13s. I have done this successfully 400+ times using the same object code. Nothing has changed (that I know of!).
Today I tried to program some brand new tiny 13s. When the chip leaves the factory SUT_CKSEL is set to 9.6MHz and 64mS and CKDIV8 is on. However when I tried to download the object code to the new chip the programmer - via AVR studio said that SUT_CKSEL was blank and CKDIV8 was unchecked. I couldn't change these via AVR Studio and, of course, the attempt to program the chip failed. Thinking the chip was bad i tried a second chip and the same thing happened. I logged the programming output to a file. All this told me was SD=0x3e..okok. Not very useful. I tried another chip and the same thing happened.
Has anyone seen this before? Is there a cure?
Thanks in advance,